Glass shaping machine



April zo, 1943.

w. B. MITCHELL GLAss sHAPING MACHINE Filed June 29, 1939 8 Sheets-Shet l w. B." MITCHELL April zo, 1943.

GLASS SHAPING MACHINE Filed June 29, 1939 8 Sheets-Sheet 2 April 20, 19,43. w. B. MITCHELL 2,316,969

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W. B. MITCHELL GLASS SHAPING MACHINE Filed June 29, 1939 8 Sheets-Sheet 6 INVENTOR @y mu/ SW1 @www w. B. MITCHELL 2,316,969

April 20, 1943.

GLASS SHAPING MACHINE 8 Sheets-Sheet 7 Filed June 29, 19`39 i @In guwfzsm f7/r f A FTE] Il ll vd.; MMI- Patented Apr. 20, 1943 asuste GLASS SHAPIN G MACHINE William Bell Mitchell, Bradford, England, as-

signor to The Mitchell Glass Company Limited,

Bradford, England Application June 29, 1939, Serial No. 281,810

Y In Great Britain June 30, 1938 This invention relates to glass shaping machines of the press and blow type used in the manufacture of bottles or other containers in an automatic and continuous manner.

In this type of machine the blank cr parison moulds pass successively beneath a flow feeder which feeds a predetermined charge or gob of glass in each mould, after which the charge is rst acted upon by a pressing member and then, after transference to a blowing or finishing mould, is acted upon by air under pressure to form the desired shape of bottle or other container.

The object of my present invention is so to construct and operate' the machine that the charge when received is not removed from the circle which it occupies until it is completely formed into the finished article.

, According to the present invention a machine of A the type to which I have said this invention relates comprises means wherein the charge of glass is received into a parison and neck ring mould 'and is pressed therein, after which the parison mould is removed and replaced by a finishing mould, the arrangement being such that the glass, after it has been received in the parison mould until it has been completely formed in the finishing mould, vmoves bodily through a circular path or arcuate path of constant radius.

In order that my invention may be more readily understood, I hereto append sheets of drawings, in which:

Fig. 1 and Fig. la taken together constitute a plan view of the forming machine to which this invention relates.

Fig. 2 and Fig. 2a when taken together constitute a side elevation in section of the forming machine shown in Figs. 1 and 1a.

Fig. 3 is a side sectional elevation of one plunger and its pressing member drawn to a larger scale.

Fig. 4 is an elevation showing the means employed for raising and lowering the pressing heads.

Fig. 5 is an elevation of a support and guiding member for the pressing head.

Fig. 6 is a plan of a portion of Fig. l drawn to anenlarged scale and shows the means for turning the pressing heads.

Fig. 7 is a view partially in section taken along the line VII-VII of Fig. 6.

Fig. 8 is an end view of the parts shownby Fig. '7.'

Fig. 9 is a plan view of the toggle lever devices for opening and closing the neck-ring moulds. A neck-ring mould is shown inthe closed position.

Fig. 10 is a similar view to Fig. 9 but shows the neck-ring mould in the open position.

Fig. 11 is a sectional elevation taken on line AB of Fig. 9.

Fig. 12 is a plan of a clamping device I employ in connection with the moulds.

Fig. 13 is a plan of the finishing mould and its operating and locking members.

In Figs. 1 and 2 the general arrangement of the parts of the machine are shown. The stationary centre pillar C is fixe-d to the base member D and the stationary cams a1, b1, c1 and' d1 are fixed to said pillar C. The continuously rotating table B is driven through the worm wheel 2 and rotates around the pillar C on bearings a2 and a3 and said table B carries the moulds (six being shown in thel drawings) to bring them successively beneath a feeding device connected with the furnace which is located at the point A (Fig. 3) but is not shown.

The actions oi each head cf the machine are successively the same and I will therefore describe the actions of one headcommencing at the feeding point A from which it moves in the direction of the arrow Fig. 1.

At this' point the cams upon the stationary column C have placed in position vertically above one another andbeneath the feeder, the blank or parison mould 3 (which is in two parts), the neck-ring mould 4 (which is also in two parts) and the guide funnel or gob-pot 5.- The finishing mould 6 has atthis time been swung upon its pivot 6a and is beyond the edge of the table in a closed position. The pressing head 'l has also been swung away from the feeding position.

At this point thehead being considered receives acharge of glass which is guided by the gob-pot to enter the moulds 3 and 4 and as it moves forward in the direction of the arrow the gob-pot 5 is swungoutwardly by the bowl or runner 5a at the endof its spring loaded connecting rod 5b drawing towards the centre the arm 5c, thus swinging the gob-pot about its pivot 5d. The pressing head 'l is also turned by the cam llc and other devices hereinafter described, so that it occupies a position directly over the moulds 3 and 4 as is shownat A2 Fig. 1. At this position the finishing mould 6, which had previously been swung beyond the edge of the table B, will open to discharge the article made by this head on the previous revolution.

As the table continues to rotate the pressing head 'l is lowered vertically and the pressing is carried out, after which the said head l is raised and turned away and the parison mould is opened with each nishing mould 6 and is carried by the support for that mould. As the pressing' head 'l moves away from the corresponding parison mould Il and the sections of that mould open, the finishing mould swings inwardly around the pivot or fulcrum pin 6a and its separate sections close around the parison 'which fis v suspen'ded from the neck mould. The blow headV then moves to position and engages the upper surface ofthe 4neck ring 4.

The specific structural details of the blow head assembly form no' partof the-present invention,

4but the blow head 50 is illustrated vas actuated by a piston 5| through the agency of a rod 52 and "the piston is shown located within "a cylinder 53,

which is secured to the swing support 'on which the finishing mould' 6 is mounted. Motivating air for the pistoncylinderassembly 52--53 is delivered bythe usual means and blowing air is delivered to the blow head in any suitable mannerf At A5 said blowing will be continuing and at A6 the iinishingmould 6 is commencing to be turned about its pivot 6d and the articlewhich has been released from the neck-ring mould is carried bythe finishing mould 6 to occupy a position beyond the edge of theftable.' The parison mould 3 and the neck-ringvmould rl! move into position by closing', andthe gob-pot V5is turned into position so that when the position A is again reached the parts have been readjusted to re-' f' `ceive anotherv charge of'glass.'

Thus it will be observed-that the glass received `in the neck-ring mould 4 at A is held by said neckring mould until it reaches A'approximately the point A6 and the said glass is thus not moved-v' from the circle upon which it isre'ceived until the glass has been formed into the'nished article.

The pressingmeans I employ are shown in Fig.

3 and comprise a relatively heavy headmember 'I which iS lift'edby `aA runner'a (Figs. 2 and 4') passing overa stationary cam 1b vadjustably xed uponthe base member of the machine. The

head member descends byY gravity and as it descends it carries a plunger 1c to press upon' the glass within the neck-ring mould 4" and the pari` son mould '3, while the pressing actions of said plunger are particularly controlled by an adjustable lever lh, the other end of which is'acted upon by an adjust'able'sp'ring 1d; carriedby the shaft llc and located between the adjustable nut 'In and a shoulder 1s on sleeve' 'Ik' which'sli'dably engages the shaft 'Ik and'is pivotally connected to Vthe lever 1h; as shown in'l Fig. 3. The adjustable lever 1h is pivoted at lf to the upper end of the pressing head1 and said pivot may be moved to "the openings 'f1 or i2 'when it is desired to vary theleverage of the lever lh.44 As stated, one end of the said lever 'Ih is arranged to span a portion at the upper end of the plunger Tc'so'as' to move samein bothdirections. whilethe'other end of said lever is connected to a shaft "llc which passes loosely within an Vopening in the shaft 7m upon which the head 1 is vfixed;

' The inner shaft -llc is encircled by the spring 1d, the lower end of which rests upon a nut 1n within the opening in the larger shaft 1m, and the upperend of which contacts with a shoulder ls on the sleeveV Tt. The milled disc 1:1: is held against rotation by a member 'It which can be moved clear of same when said disc is to be rotated.

Rotation of said disc 1x rotates the shaft 'Ik and causes the nut 1n (which is held against rotation as stated) to move over the shaft 'Ik and so vary the pressure of the spring 1d.

When the head member 'I descends it reaches a position where it is arrested by a stop piece x and the plunger plate 1y is then in position on the neck-ring mould. At this time, the plunger 1c will have entered the moulds and the pressing of theglass will be brought about wholly by the pressure'of the spring 1d, and therefore said spring only requires to be extended and compressed a small amount, as the whole head member moves the greater amount.

As stated the raising of the head member] is --carried out Vby arunner lla contacting-with a cam 'lb and these runners 1a (one for each head) are mounted upon levers Ila pivoted to a bracket Hb extending from the undersurface of the table B. The other end of the lever Ila is forked totake overa Yreducedportion ofthe shaft 1m.jThe guidingof the pressing heads in' their vertical paths while being raised and lowered is effected by a bowl or runner I 'Ic mounted upon the member 'l engaging a' slot 11d in the fixedv bearing ile.` The said guiding slot Hd extends at its upperend Ilzc in a horizontal direction so that when vthe head 1 is fully raised'suitable spring fdevices not shown will return thesame sotha't the runner Hc will pass along the horizontal portion I'l. By these meansA the cam'trackV 'lb which raises the heads may be of reducedlength Vas the horizontal parts of thev slots will retain the heads in their raised positions. Y 1 A When said heads 'I are in their highest positions stated av spherical bowll Hj (Figs. 6 and 7) which is fixed to the lower end of the shaft 'lm is arranged to be in alignment with 'a bowl Ilg mounted at the end of a sliding member Hh which extends beyond the edge of-theitable B to VVhaveV another bowl Ilk at its other `end. This bowl l'lk is in alignment with a normally stationary cam lever Ill which is pivoted at Hy to a bracket carried by the base member of the machine, so that when said bowl I'lk contacts with said cam lever lll the Vmember Hh is slid inwardly towards the centre of the machine so that the bowl I'Ig will move the spherical bowl Hf from the position shown in full lines Fig. 6 to that shown in broken lines in the same figure. The turning of the head member 'l' thus brings the bowl Hc (hereinbefore described) into the vertical slot lld so that a clamlb may allow the head to descend byrgravity. The lever l'll` is spring loaded by means of spring Iflmwhich surrounds a clevis bolt I8a pivotally secured to the lever. rlhe bolt |311 extends loosely through anV apertured lug I 8b and constitutes a guide for the spring lm which abutsa'g-ainst'the lug |8b. On the outer end of the member i'l'h I` mount an adjustable stop Ils and upon the edge., of the table' pivot a lever Ilt which when turned into the position shown by Fig. 7 will prevent the slide Ifli from being fully moved and the shaft lm will not be turned sufficiently for. .the runner Hc to descend the not 11d. Bythis adjustment of the levers I't one er1-riore heads A cank bel prevented from turning and/therefore pressing will not take column'. lSuch being' the nature Amy said invention,'what Iclaimis': i f .1L` In' combinationin a glass-forming' machine, a rotatable table, means for'continuously rotating place by those heads. The spring Ilm will allow the lever HZ to move in these circumstances.

As the relative positions of the turning of the I head members and the raising and lowering of same must always be the same I arrange the two with the glass can be varied.

When the head member 1 descends it is, as described, arrested by stop piece m1 and in order that the plunger plate 1y will have a pressure vupon the neck-ring mould 4 I mount saidplate upon a cage member 1u which is loadedby springs 1w between its limits of' movement.

T he locking of the halves ofthe neck-ring moulds and the finishing moulds in their closed positions I carry out by devices hereinafter explained, while in connection with the parison moulds 3 I provide clamps 20 (Fig. 12) pivoted at 253e to the plate B1 and operated by the cam d1 through a connecting rod 20d. The jaws of said clamp are arranged to have rollers a and 20D to take against the outer surfaces of eXtensions 3x, one from each half of the carrier .of the parSon mould 3. The outer surfaces of the extensions 3rv are tapered so that the advancing of the rollers 20a and 26h over same will force' together and lock the halves ofthe mould .3, and I have found that by making use ofthe rollers as described a greater angle of taper may be -used without the clamping jaws becoming wedged upon the extensions 3x.

The devices (Figsi 9, 10 and ll)` fo1. opening, closing and clamping the neck--ring` moulds 4 comprise a lslide al which is moved radially by a cam on the centrefcolumn C and having horizontalcross members 4e andllf connectedthereto by spring loaded rods 4x and 411, andsaid `cross members have a space between them and in which threeI bowls or runners 4h, 4g and 4k are mounted.' 4Extensions'fll and 4m form theY halves of the neckring mould carriers and pass one on each side ofthe centre bowl 4g to be pivoted upon'the vertical pin 4j carried by the plate B1. The inner portions ll and m1 vof the extensions 4Z and 4m have cam surfaces formed upon them 'i so thatas thecross members 4eand 4f are moved towards the centre of the machine the bowl 4g will cause the halves of the mould to open. When the members lle and 4f are moved outwardly the bowls 4h and 4k act Aupon the outer surfaces l2 andfm2 of the projections and forcetlfie 'halves of the mould together, and by the said bowls reaching the surfaces Z3 and m3, which are ta pered, the moulds are locked together.

The iinishing moulds 6 I open, `close and lock b'y 4toggle levers 6b and Bc (Fig'. 13) and'I arrange the arm Ec to be adjustable.

The opening and clsinglof thesev moulds is effected by a4 piston rod 'Gd' which is connected thereto, its piston `being moved in both' directions witninthe cynnder se lay-compressed air which is conducted theretoby the flexible tubes.4 The turning of the finishing moulds-is carried out by the shaft 6a havingiixed to it ai pin Isa which is mtatemby a rack leb 'the other end of which'hasa bowl in contact with'an adjustable stationary cam onjthe centre and 'object'of said table, a sectional neck-ring mold, a sectional parison mold, a sectional finishing mold all carried by said table, means for opening and -closing the sections of said neck-ringmold and for locking such sections in closed position, means for opening and closing the sections of said iinishing mold and for, locking such sections in closed position, means for ropening and closing the sections of said parison mold, means for locking the sections of said parison moldl in closed position, said neck-ring and said parison molds being so arranged with relation to said table that the sections of said neck-ring mold when closed move with said table at a constant radius from the axis of rotation of the table and the sections of said parison mold close in alignment therewith, mechanism for actuating the operating means of the sections of said` parison mold and the operating means of the sections of said iinishing mold to successively move such sections into closed positions in alignment with said neck-ring mold while the neck ring is moving with said tableat a con.- stant radius from the axis of rotation of said table, and for actuating said parison locking means to lock the'section of4 said parison mold closed, mechanisms for swinging said iinishing `mold to and from alignment with the closed sections of said neck-ring mold and mechanisms for actuating saidv neck-ring-mold-actuating means to open the sections of said neck-ring mold while the sections of the finishing mold are closed and in alignment therewith and to close the sections of said ,neck-ring mold as said finishing mold is moved away from the position of alignf ment therewith. j

2. The combination `in a glass-forming machine,

. a rotatable table,A means for rotating said table,

.ring mold and said'parison mold being so located with relation tosuch table that they are always in alignment when closed, means carried by the tablefor moving the Vnnisliing mold into and out of a position of alignment with the closed neckring mold, means for locking the sections of said parison mold'in a closed position and mechanisms for actuating the aforementioned means constituting a part of each such assembly; to close the sections o'fjthe neck-ring mold and parisonmold and to lockthe" sections of vthe parison mold closed Y while said linishing mold is moving out ofthe position of alignment with said neck-ring mold', to open'said parison mold while said'iishing mold is moving into the position of alignment with the closed neck-ring mold to then open the neck-ring mold and to move the finishing mold out of alignmentA therewith and to then openthe lsections of mold, finishing mold andA pvsaid nishingmold.

i 3. In combination in aglassforrning machine,

' a rota'tabletable, means for continuously rotating'said table, acooperating neel; ring. parison ,seing head carried by'said table, separate carried by said table for opening andiclosingfsaid neel: ring and parison mold and so located on said tablethat said' neck ring and parison mold are in alignment whenzclosed, means carriedby said'tablefor opening'and tclsirig said iinishing moldymeans for swinging saidfiinishing 'mold into and out vof aposition of a .alignment ywith V said neck ring,

j f.,:r 'r'1ean`s` ,er swinging 'saidpfessing.,hea'dintlo` and -'out of alignment with said neck ring, means for actuating said pressing rhead to pressa .charge of,A glass ,containedwithin said neck. ringand pari- `son inoldand mechanisms for actuating all said previouslyvmentioned means to close said lneck ring and parison mold while saidf'lnishing mold is swinging awayfrom the position ofY alignment with y,sa'idneck ring, to. then swing saidpressing .head into the position of alignment with said neck ring, to then open said finishing mold, to thenactuatethe pressing head Ato press a charge of glass in said neck ring and parison mold, to

then, open said parison mold andswing said finishing mold tothe position of alignment `with said neck. ring while said pressing head is movingawaygfrom the, position of alignment with ,i l said pressing head, to ,then close said nishing mold inalignment with said neck ring, to then .l opensaid v'neck ring and to then swing the finishing `molds while, closed away from .the position of alignment with said neck ring.

4, In'combination ina glass forming machine,

.. a vrotatable tab'lemeans for continuously rotatv ing said tablecooperating molds carried by said I, table `comprising a sectional neck ring mold, a

sectionall parison mold andra sectional finishing `r mold, means vfor. actuating `the sections of said neck` ring mold to open and close the same and` ,hold it in `a fixed. position on said tablewhen closed, means for actuating thesections of said Aparison'mold to fopen and close the same and to hold said parison mold in a fixed position on said table and in alignment with said 4neck ring mold when closed, means, for actuating the sections. o f Asaid,.finishing mold toopen and close l ,the same, means for moving said finishing mold to andawayfroma position of alignment with said neck ringmold, and mechanisms fory actuatv king allsaid means-whereby `the neck ring mold cooperates with both .the parison mold and the `nishing mold in .the forming of' .a glass .,article, theneck mold starts to open while the finishing 5. In combination in aglass-forming machine,

y a rotatable table, means for continuously: rotat ..,ing' thesame, a plurality of glass-article forminglassemblies. carried bysaidtable, each such assembly including a sectional neck-ring mold, .means for opening and closing the sections-thereof. and locking such sections inclosed position,v la sectional parisonA mold, means for opening and r,cosing the sections thereof and separate means for :locking such. sections in-'closed position, a sectional nishing mold. means for opening and .closing such sectionsfand means for swinging the finishing mold to `and from a position of alignment with said neck-ring mold, the sections of the parison-moldand the. neck-ring mold 'being so arranged with relation to said table that the neck-ring and parisonmolds are in alignment :when .closed and constitute a charge-receiving receptacle, and mechanisms for actuating all said rmeans to lcause, saidparison mold andnishing mold to alternately cooperatewitb, `said neckringA `mold in the operation oi forming a glass article, while said neck ring is `moving.Withsaid table at a A.'zo'n'stantradius from theaxis orro- ACn the finishing mol-d is in alignment. therewith, to

.thereupon swing said finishing mold` from the position of alignment with said neck-ring. mold and to thereupon close said parison and neck-.ring molds.

6. In combination in a glass-formingvmachine, ,a stationarybase, a table. rotatably mounted on said base, glass article-forming `assemblies mounted on said table and each. including a neck ring mold, a parison mold, a nishing mold,

i a pressing plunger and a pressing head carrying saidplunger, means for aligning saidneck ring mold and said parison mold, means for swinging said head to and from a ,position in which s aid plunger is aligned Withsaid aligned molds, means for swinging said finishing mold tcand from a position of yalignment with said,L neck ringmold, a cam icarried by the. base of said; machine -ior controlling the pressing movement of the pressing head of all said assemblies, a cam yieldingly mounted on said base for controlling the swinging movement of the heads of all said assemblies, and a separate turning mechanism for swinging the finishing mold of each assembly to and from the position'of alignment.

7. In a glass-forming machine, a stationary base, a table rotatably mounted on vsaidbase, a plurality of glass article-forming .assemblies mounted on said table, each such assembly including a pressing head mounted to,swing laterally to and from an operating positionand. to reciprocate vertically, a cam mounted-'onlsaid base for controlling the reciprocating movement of. the pressure heads of all said assemblies, a cam `yieldingly carried by said base. for controlling the swinging movement of the heads of all said assemblies, andmeans associated witheach suchhead adjustable to limit thel effectiveness of said last mentioned cam withrelation to the associated'head.

,Y 8. In a glass-forming machine, a stationary base, a table rotatably mounted on said base, a plurality of v glass- Ware-forming, assemblies mounted on said tableand each includingcooperatingl glass-formingmolds.- and a pressing head, a pressing plunger carried by each` such head and yieldingly positioned with y,relation thereto, cams carried bythe base of the machine forV controlling `the operation. of all .saidheads,

- and a separate adjustable means for positioning the plunger on each such.head.

9.7In a glass-forming machine, a stationary base, a table rotatably mounted on said-base, a

g plurality `of? glass-article-formingV assemblies mounted on said table,feachincluding a `pressing head mounted to swing` laterally to and from -an operating position and to reciprocate vertically, a cam'mounted on said base for` lifting the `heads Vof all said assemblies, means for controlling the movement o1' said head including a guidingroller s slot.

10. In a glass-forming machine, astationi'iryV Y base, a tablegrotatably mounted onfsaid base, a

plurality `of glass-article-forming V`assemblies mounted on said table. each l including a grxawityactuated pressing head, apressing plungenzrnovably mountedon saidfhead, a :spring Yforzcontrolling the positioning Voi'said plungerxwith relation toxsaidrhead, a cam carried Vby...said base` for lifting said pressing head, means carried by said table for holding said head in a raised position and a second cam carried by said base for moving said head to release it from said headholding means.

11. In a glass-forming machine, a stationary base, a table rotatably mounted on said base, a plurality of glass-article-iorming assemblies mounted on said table, each including a. gravityactuated pressing head, a pressing plunger movably mounted on said head, a spring-actuated lever for controlling the movement of said plunger with relation to said head, and a cam carried by said base for raising said head as a preliminary to a pressing operation.

l2. In combination in a rotating glass forming machine, a rotatable table, means for rotating said table, cooperating molds carried by said table comprising a sectional neck ring mold, a sectional parison mold and a sectional nishing mold, means for actuating the sections of said neck ring mold to open and close the same and hold said neck ring mold in a iixed position relatively to said table when closed, means for actuating the sections of said parison mold to open and close the same and to hold said parison mold in alignment with said neck ring mold when closed, means for delivering a charge of glass to the aligned molds, means for actuating the sections of the iinishing mold to open and close the same, means for moving the finishing mold to and from a position of alignment with said neck ring mold, and mechanisms for actuating all said means, whereby said neck ring mold cooperates with both said parison mold and said nishing mold in the forming of a glass articleQthe neckring mold starts to open while the finishing mold is in alignment therewith and starts to close during the movement of the finishing mold from alignment with the neck-ring mold preparatory to receiving a charge of glass whereby the articleforming cycle of the neck rin'g and the parison molds overlap that of the cooperating nishing mold and the nishing mold completes its cycle and delivers one article after the cooperating neck-ring mold and the parison mold receive a charge ci glass in initiating the next succeeding articleorming operation.

13. In combination in a glass-forming machine, a rotatable table, means for rotating the table, a glass-article-iorming assembly carried oy the table including a sectional neck-ring mold, means for opening and closing the sections thereof, a sectional parison mo-ld, means for opening and closing the sections thereof, a sectional finishing mold, means for opening and closing the sections thereof and means for moving said iinishing mold to and from a position of alignment with said neck-ring mold, saidv neck-ring mold and said parison mold being so arranged with relation to said table that the sections of the neck-ring mold when closed move with the table at a constant radius from the axis of rotation of the table and the sections of said parison mold close in alignment therewith, and mechanisms for actuating all said means to cause said parison mold and said iinishing mold to alternately close in alignment with said necke ring mold While said neck-ring mold is moving with said table at a constant radius from the axis of rotation thereof, to cause the neck-ring mold to start to open while said finishing mold is in alignment therewith and to cause the article-forming cycle of the neck-ring mold and parison mold to overlap that of the nishing mold whereby the finishing mold opens to complete its cycle by delivering one article after said neck-ring and parison molds have initiated the formation of the next succeeding article.

WILLIAM BELL MITCHELL. 

